Cylinder-grinding machine



W. H. JOHNSON. CYLINDER GRINDING MACHINE. APPLICATION FILED SEPT. 4. 1920.

Patented Dec. 6, 1921.

2 SHEETSSHEET I.

W. H. JOHNSON. CYLINDER GRINDING MACHINE. APPLICATION FILED SEPT.4. 1920.

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2 SHEETS-SHEET 2- Patented Dec; 6, 1921.

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UNITED STATES WILLIAM H. JOHNSON, OF BRANDON, VERMONT.

CYLINDER-GRINDING MACHINE.

Specification of Letters Patent.

Patented Dec. 6, 1921.

Application filed September 4, 1920. Serial No. 408,335.

T 0 all 20/2 am it may concern Be it known that I, \ViLLIAM H. JoHN- SON, a citizen of the United States, residing at Brandon, in the county of Rutland and State of Vermont, have invented certain new and useful Improvements in Cylinder- Grinding Machines, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to cylinder grinding machines.

An important object of the invention provides in a grinding mechanism, a novel and improved grinding bar wherein the grinding element is centrally disposed of the bar, thereby eliminating chattering now con1- monly present where grinding wheels of the overhanging type are employed.

A further object is to provide a bar of the above character which is rotatable and in which the grinding element is adjustable transversely of the bar to permit of the grinding of cylinders of different diameters.

A further object is to provide a. bar of this character which is rotatably and longitudinally adjustable and at the same time firmly supported at the ends and wherein the grinding element is transversely adjustable of the bar.

A still further object is to provide means in a bar of the above character whereby the dust formed in grinding is withdrawn through the bar in order to prevent such dust from interfering with further grinding and with the observations of the operator.

Further objects and advantages will become apparent throughout the course of the following description.

In the accompanying drawings wherein for the purpose of illustration is shown a preferred embodiment of my invention and wherein like reference characters designate like parts throughout:

Figure 1 is a side elevation of the cylinder of a grinding machine embodying my invention.

Fig. 2 is an enlarged fragmentary side elevation of the central portion of the grinding bar.

Fig. 3 is a fragmentary plan View of the central portion of the grinding bar.

Fig. 4 is a section taken on the line 4-4 of Fig. 2. i

Fig. 5 is a longitudinal section taken through one end of the boring bar, said bar being rotated in any degree from the positions shown in Figs. 2 and 4.

Fig. 6 is a similar section taken through the other end thereof.

Fig. 7 is an end view of the boring bar showing the mounting thereof, and

Fig. 8 is an end view showing the mounting of the opposite end thereof.

Fig. 9 is a section on the line 9-45 of Fig. 3.

Referring now more particularly to the drawings, the numeral 10 indicates a suitably supported bed having mounted upon the upper surface thereof means 11 for adjustably securing thereto an engine cylinder 12. Mounted adjacent the bed and preferably beneath the same in journals 13, is a rotatable shaft 14 having pulleys 15 and 16 mounted thereon. This shaft 14 may be driven in any suitable manner. It will be understood that the bed and the mechanism associated therewith, with the exception of that comprising my bar, is to be considered entirely in a diagrammatically illustrated sense, as it is not my intention to be limited in any manner to this mechanism as illustrated.

A. tubular bar 17 is provided having centrally thereof an enlargement 18. (lne face of the enlargement 18 is cut away, as at 19. to expose the interior of the bar. The opening thus formed is closed by a plate 20 removably secured to the enlargement which plate covers the entire opening with the exception of a small space 21. Mounted interiorly of the tubular bar in one end thereof and at the corresponding end of the enlargement 18 are bearings 22, in which is rotatably mounted a shaft 23, which extends longitudinally of this end of the tubular bar and which is provided within the enlarge ment 18 with an internal gear 24.

The interior wall of the enlarged portion of the bar opposing the opening 19 is flattened, as at 25, and a plate 26 is disposed thereagainst and extends longitudinally of the enlargement 18. At the end thereof adj acent the internal gear 24 a pivot pin 27 extends through the plate and through the side walls f the enlargement 18 and is secured against longitudinally shifting as at 28. At the opposite end of the plate. headed bolts 29, having their heads disposed toward the opening 19 extend through openings 30 formed in the plate and have threaded engagement with the wall of the enlargement 18 as at 31. Compression springs, 32, surround these bolts extending intermediate the heads thereof and the plate 26. It will be seen that oneend of the plate 26 is free for oscillation but is held against such oscillation by the springs 32.

Mounted in the wall of the enlargement 18 opposing the opening is a screw abutting the upper surface of the plate 26 as at 34. The screw is provided externally of the enlargement with a pointer finger 35 coacting with a dial D, preferably formed in a recess 1n the outer wall of the enlargement, thls being preferably subdivided to indicate thousandths of an inch movement of the plate and its associated mechanism.

The plate has extending downwardly therefrom, or toward the opening 19, bearings 36 in which is rotatably rnounted a shaft 37 having at one end a pnnon 38 engaging the internal gear 24 at a point next adjacent the opening 19. At its opposite end the shaft is provided with any suitable means 39 for detachably securing thereto a grinding element 40, which projects through the opening 21 in the enlargement 18.

The reduction at one end of the enlargement 18 to the normal size of the bar 17 has the form of an abrupt shoulder 41. A sleeve 42 surrounds this end of the bar 17 receiving the bar rotatably. At the end of the bar a collar 43 maintains the sleeve 42 in engagement with the shoulder 41. It will be seen that the bar 17 is rotatable within the sleeve 42 but is held against longitudinally shifting with relation thereto. The sleeve 42 is preferably provided internally with oil grooves 44 and through the wall thereof with openings 45 communicating with these grooves. Formed upon or secured to the sleeve 42 is a rack 46, the purpose of which will presently appear.

The sleeve is mounted for longitudinal shifting but held against rotation within a bearing 47 mounted upon the upper surface of the bed 10. This bearing has rotatably mounted therein a shaft 48 bearing a pinion 49 engaging the rack 46 and has upon one end thereof an operating hand wheel W. I do not wish to be understood as limiting myself to the use of a hand wheel in connection with shaft 48, as this'shaft may be mechanically driven by suitable connection with the source of power if so desired.

Mounted upon the bed 10 at a point remote thereon from the bearing 47 with respect to the adjustable supports 11, is a second bearing 50. At the corresponding end of the bar 17, a sleeve 51, surrounds the bar and has secured to the outer end thereof a worm gear 52. Supported in bearings carried by the bearing 50 is a transverse shaft 53 having mounted thereon a worm 54 which meshes with the gear 52. The sleeve 51 and gear52 have secured thereto a spline key 54, which operates in a groove 55 extending longitudinally of this end of the bar. It will be seen that the sleeve 51 and gear 52 are held against rotation with relation to the bar 17 but the bar 17 may be longitudinally shifted through such sleeve and gear.

The shaft 53 may be driven by any suitable connection with the shaft 14 shown in the present instance as comprising a pulley 56 mounted on the shaft 53 and connected with the pulley 16 of the shaft 14 by a belt 57. At the opposite end of the bar the shaft 23 has secured thereto in any suitable manner a pulley 58 connected by a belt 59 with the pulley 15 of the shaft 14. It will be noted that the pulley 15 is of considerable breadth with respect to the belt 59 to compensate for longitudinally shifting of the bar 17.

In order to prevent collection of the dust formed by grinding during a grinding operation the end of the bar 17 slidably mounted in the sleeve 51 is interiorlyscrew threaded as at 60 for the reception of a p 1pe 61 which is in connection with a suct1on fan 62 driven in any suitable manner, as by the shaft 14 as indicated at 63. It will be obvious that the dust from grindlng will be drawn through the opening 21 and pass longitudinally through the bore pf the bar 17 and through pipe 61 to the In order that the bar may be readily removable from the machine I prefer that the bearings 47 and 50 be constructed as illustrated. In this connection the base B is formed with the lower half of the bearing and has pivotally connected there to as at P the upper half G of the hearing. The upper and lower halves are provided with coacting ears G adapted for the re ception of a securing bolt E. Each lower half B has formed thereon or secured thereto lugs L forming bearings for their respective shafts. It will be obvious that by removing the securing bolts E the upper sections of the bearings may be thrown back and the bar removed therefrom and replaced by a bar capable of making a out beyond the adjustable limit of the bar pre viously mounted therein. To this end I likewise prefer that the pipes 61 be formed in two sections connected by a coupling 64.

. The operation of my device is as follows:

The cylinder to be ground, with the head thereof removed, is placed within the adjustable supports 11 and correctly ositioned. The bar 17 is then placed within the bearings and the cutting head 40 adjusted through the medium of the adjusting screw 33. The grinding operation can then be started and rotation being transmitted to the wheel by pulley 15, belt 59, pulley 58, shaft 23, gear 24, pinion 38 and shaft 37.

Simultaneously the bar is rotated as awhole through the medium 16, belt 51, pulley 56, shaft 53, worm 54 and gear 52. As the cutting is completed in one section of the cylinder the cut ma be advanced by rotation of the wheel If,-upon completion of the cut it is found that a further out of, for example one one-thousandth of an inch is needed, the bar is withdrawn and the adjusting screw turned to cause the pointer 35 to shift one subdivision of the graduation of the dial D thereby shifting the grinding element 40 one one-thousandth of an inch outwardly and positioning properlly for the cut.

t will be obvious that my bar is particularly well adapted for use 1n grinding cylinders with removable cylinder heads and it will likewise be obvious that the construction employed may be varied greatly in detail without in any manner departing from the spirit of my invention. I accordingly do not limit myself tothe specific construction herein before set forth except as so limited by the subjoined claims.

Having now described my invention, what I claim is:

1. In a device of the type described, a hollow bar, means for rotating the bar, means for shifting the bar longitudinally, a member rotatably mounted within the bar, an abrasive wheel carried by said member and having a portion thereof projecting through an opening formed in the side wall of the bar means for rotating said rotatable element and means for creating suction at the opening.

2, In a device of the type described, a hollow bar provided in the side wall thereof intermediate its ends with an opening, means for rotating the bar, means for longitudinally shifting the bar, a shaft disposed longitudinally of the bar and having one end thereof disposed adjacent saidopening, means for securing an abrasive wheel to the end of the shaft, said wheel projecting through said opening, means for adjusting the end of the shaft and said wheel transversely of the bar, a second shaft disposed longitudinally of the bar and having one end thereof disposed adjacent the end of the first named shaft remote from that hearing abrasive wheel and a flexible connection between the adjacent ends of said shafts.

3. In a device of the type described a hollow'bar provided in the side wall thereof' intermediate its ends with an opening, means for rotating the bar, means for longitudinally shifting the bar, a shaft disposed longitudinally of the bar and having one end thereof disposed adjacent said opening, means for securing an abrasive wheel to the end of the shaft, said wheel projecting through said opening, means for adjusting the end of the shaft and said wheel trans versely of the bar, a second shaft disposed longitudinally of the bar and having one end thereof disposed adjacent the end of the first named shaft remote from that bearing abrasive wheel and a flexible connection between the adjacent ends of said shafts comprising, an internal gear secured to the end of the last named shaft and a pinion secured to the first named shaft and meshing with said internal gear.

4. In a device of the type described, a hollow bar provided in the side wall thereof intermediate its ends with an opening, means for rotating the bar, means for longitudinally shifting the bar, a plate having one end thereof pivotally mounted within the bar and having the free end thereof disposed adjacent said opening, a shaft rotatably mounted upon said plate, an abrasive wheel carried by said shaft and projecting through said opening, means for shifting said plate about the pivot thereof to thereby transversely adjust said abrasive wheel with respect to said bar, and means for rotating said shaft.

5. In a device of the type described, a hollow bar provided intermediate the ends thereof with an opening extending through the side wall thereof, means for rotating the bar, means for shifting the bar longitudinally, a plate pivotally mounted within the bar and having the free end thereof disposed adjacent said opening, a shaft rotatably mounted upon said plate, an abrasive wheel secured to said shaft projecting through the opening in the said wall of the bar, means normally holding said plate and abrasive wheel in withdrawn position, means extending through the said wall of the bar engaging the plate for transversely shifting the free end of the plate and wheel against the action of the last named means, and means for rotating said shaft.

6. In a device of the type described, a hollow bar provided intermediate the ends thereof with an opening extending through the side wall thereof, means for rotating the bar, means for shifting the bar longitudinally, a plate pivotally mounted within the bar and having the free end thereof disposed adjacent said opening, a shaft rotatably mounted upon said plate, an abrasive wheel secured to said shaft projecting through the opening in the said wall of the bar, means normally holding said plate and abrasive wheel in withdrawn position, means extending through the side wall of the bar engaging the plate for transversely shifting the free end of the plate and wheel against the action of the last named means, and means for creating suction through the bar and at said opening.

7. In a machine for grinding the cylinders of engine blocks having removable heads embodying a bed, means carried by thebed for adjustably supporting thereon the engine cylinder, bearings extending upwardly from said bed at opposite sides of said adjustable means, a bar rotatably and longitudinally shiftably mounted in said arings, means for rotating said bar, means for shiftin the bar longitudinally, an opening formed in the side wall of the bar, an abrasive wheel mounted Within the bar and projecting through said opening, means for driving said abrasive wheel extending longitudinally and interiorly of the bar at one end thereof, and means connecting the other end of the bar with a suitable source of suction.

8. In amachine for grinding the cylinders of en ine blocks having removable heads embo ying a bed, means carried by the bed for adjustably supporting thereon the engine cylinder bearings extendin upwardly from said bed at opposite sid es of shifting the bar being said adjustable means, a bar rotatably and longitudinally shiftabily mounted in said bearings, means for rotating said bar,vmeans for shiftin the bar longitudinally, an opening formed in the side wall of the bar, an abrasive wheel mounted within the bar and projecting within said opening, means for drivin said abrasive wheel extending longitudina ly and interiorly of the bar at one end thereof, means connecting the other end of the bar with a suitable source of suction, said means for rotating and longitudinally secured to said bearings, said bar being readily removable from said bearings and means disposed exterior-1y of said bar for adjusting said abrasive wheel transversely thereof.

In testimony whereof I hereunto affix my signature.

WILLIAM H. JOHNSON. 

